Bill Wright wrote:
I have bought and installed some 10W and 30W LED outdoor floodlights. I
was interested by the fact that the width of the beam is considerable,
and the illumination is very even. I thus examined the pattern of the
light coming from the units, using a piece of welding glass. The large
pseudo-parabolic reflectors play no part in the beam shaping. The light
from the central LED cluster scarcely touches them, and through the
welding glass they appear black almost all over. The LEDs are recessed
and there is no direct path from the surface of the LEDS to most of the
the surface of the reflectors. The limits of the beam are defined by the
line from the LEDs to the edge of the frame. Hence the illumination is
very even but has a sharp edge cut-off. It appears that the reflectors
are purely for show.

I'm not complaining; the lights work well and are very impressive. But I
wonder if the market will mature and we will then have LED floods
without the unnecessary reflectors? The things would certainly look
neater without them.

I'm not going out in the storm to look closely at mine, but it's a 20W
unit rather like this:

http://www.ebay.co.uk/itm/321299520316

The LEDs appear to be surface-mounted in a rectangular grid pattern on a
PCB, slightly bigger than a postage stamp.

--
Mike Barnes